TL431BCDR2 Equivalent & Substitute Parts

Part Overview

The TL431BCDR2 is a shunt voltage reference IC manufactured by onsemi, designed for adjustable voltage regulation applications. This component provides a stable 2.495V reference output with ±0.4% tolerance across a 0°C to 70°C operating range, supporting output currents up to 100 mA in an 8-SOIC surface mount package.

The TL431BCDR2 is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and support long-term production requirements for applications utilizing this reference voltage topology.

Key Parameters

Parameter	Value
Manufacturer	onsemi
Part Number	TL431BCDR2
Reference Type	Shunt
Output Type	Adjustable
Voltage Output (Min/Fixed)	2.495V
Voltage Output (Max)	36V
Current Output	100 mA
Tolerance	±0.4%
Temperature Coefficient	50 ppm/°C Typical
Current Cathode	1 mA
Operating Temperature	0°C to 70°C
Package	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the TL431BCDR2 is determined by the following critical electrical and mechanical parameters:

Core Compatibility Criteria:

Reference type: Shunt voltage reference
Output type: Adjustable
Voltage output range: Minimum 2.495V to 2.5V, maximum 36V
Current output: 100 mA
Tolerance: ±0.4% to ±0.5% (tighter tolerances acceptable)
Temperature coefficient: 50 ppm/°C or better
Cathode current: 1 mA nominal
Package: 8-SOIC form factor
Mounting: Surface mount

Substitute parts are grouped into three categories:

Direct Substitutes (Identical Electrical Specifications): Parts with matching voltage output, tolerance, and current ratings in the same package.

Similar Substitutes (Relaxed Tolerance): Parts with slightly higher tolerance (±1% to ±2%) but identical voltage range and current capacity, suitable where precision requirements permit.

Upgrade Substitutes (Enhanced Performance): Parts with identical or superior electrical specifications and extended operating temperature ranges, offering improved reliability and compliance.

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min)	Voltage Output (Max)	Tolerance	Current Output	Operating Temp	Product Status	RoHS Status	Packaging
TL431BCDR2	onsemi	2.495V	36V	±0.4%	100 mA	0°C to 70°C	Obsolete	Non-compliant	Bulk
TL431BCDR2G	onsemi	2.495V	36V	±0.4%	100 mA	0°C to 70°C	Active	ROHS3 Compliant	Tape & Reel
TL1431CDR	Texas Instruments	2.5V	36V	±0.4%	100 mA	0°C to 70°C	Active	ROHS3 Compliant	Tape & Reel
TL431BCDR	Texas Instruments	2.495V	36V	±0.5%	100 mA	0°C to 70°C	Active	ROHS3 Compliant	Tape & Reel
TL1431MDREP	Texas Instruments	2.5V	36V	±0.4%	100 mA	-55°C to 125°C	Active	ROHS3 Compliant	Cut Tape & Digi-Reel
TL1431QD	Texas Instruments	2.5V	36V	±0.4%	100 mA	-40°C to 125°C	Active	ROHS3 Compliant	Tube
LM431BCMX	National Semiconductor	2.495V	36V	±1%	100 mA	-25°C to 85°C	Active	Undefined	Bulk
LM431CIMX	onsemi	2.495V	36V	±0.5%	100 mA	-40°C to 85°C	Active	ROHS3 Compliant	Bulk
KA431DTF	onsemi	2.5V	36V	±2%	100 mA	-25°C to 85°C	Active	ROHS3 Compliant	Bulk
LM431AIMX	National Semiconductor	2.5V	36V	±2%	100 mA	-40°C to 85°C	Active	Non-compliant	Bulk
TL1431CD	STMicroelectronics	2.5V	36V	±0.4%	100 mA	-20°C to 70°C	Obsolete	ROHS3 Compliant	Bulk

Engineering Selection Recommendations

Primary Recommendation - Direct Substitute: TL431BCDR2G is the optimal direct replacement. This part maintains identical electrical specifications (2.495V output, ±0.4% tolerance, 100 mA current) and operating temperature range as the original TL431BCDR2. The primary difference is packaging format (Tape & Reel versus Bulk) and product status (Active versus Obsolete). RoHS3 compliance provides regulatory advantage for new designs and long-term supply assurance.

Secondary Recommendation - Cross-Manufacturer Direct Substitute: TL1431CDR (Texas Instruments) provides equivalent electrical performance with ±0.4% tolerance and identical current/voltage specifications. Output voltage is 2.5V versus 2.495V, representing a 0.02% difference within acceptable tolerance bands. Active product status and ROHS3 compliance support production continuity.

Extended Temperature Range Option: TL1431MDREP and TL1431QD offer identical electrical specifications with extended operating temperature ranges (-55°C to 125°C and -40°C to 125°C respectively). These upgrades are suitable for applications requiring enhanced thermal performance or military/industrial temperature specifications.

Relaxed Tolerance Alternatives: TL431BCDR (±0.5% tolerance) and LM431CIMX (±0.5% tolerance) are acceptable where application requirements permit slightly higher tolerance. Both maintain 100 mA output current and 36V maximum voltage.

Not Recommended: KA431DTF and LM431AIMX exhibit ±2% tolerance, representing a five-fold increase in tolerance specification relative to the original part. These are suitable only for applications with relaxed precision requirements.

Frequently Asked Questions (FAQ)

Q: Can TL431BCDR2G be used as a direct replacement for TL431BCDR2? A: Yes. TL431BCDR2G is electrically and functionally identical to TL431BCDR2, with the same 2.495V output, ±0.4% tolerance, and 100 mA current rating. The primary difference is packaging format (Tape & Reel) and active product status. Both are 8-SOIC surface mount packages with identical pinouts.

Q: What is the significance of the voltage output difference between 2.495V and 2.5V? A: The 0.005V difference represents a 0.2% variation. Within the ±0.4% tolerance specification of the TL431BCDR2, this difference is negligible and does not affect functional compatibility in most applications. Both values fall within the adjustable reference voltage range.

Q: Are there compatibility concerns when substituting onsemi parts with Texas Instruments equivalents? A: No. TL1431CDR and TL431BCDR (Texas Instruments) maintain identical electrical specifications, package geometry, and pinout as the onsemi TL431BCDR2. Cross-manufacturer substitution is supported by matching electrical parameters and 8-SOIC package standards.

Q: Why should I consider TL1431MDREP or TL1431QD if the operating temperature range is wider than required? A: Extended temperature range parts provide design margin and supply chain flexibility. If your application operates within 0°C to 70°C, the standard temperature range parts are sufficient. However, upgrade parts offer identical electrical performance with enhanced reliability specifications at no electrical cost.

Q: What does RoHS3 compliance mean for part selection? A: RoHS3 compliance indicates the part meets current environmental and hazardous substance restrictions. For new designs and long-term production, RoHS3 compliant parts (TL431BCDR2G, TL1431CDR, TL431BCDR, TL1431MDREP, TL1431QD, LM431CIMX, KA431DTF) are preferred over non-compliant alternatives to ensure regulatory compliance and supply continuity.

Q: Can I use parts with ±2% tolerance (KA431DTF, LM431AIMX) as substitutes? A: Only if your application design permits ±2% tolerance. The original TL431BCDR2 specifies ±0.4% tolerance. Using ±2% parts introduces five times greater tolerance variation and may affect circuit performance in precision voltage reference applications. Verify application requirements before substitution.

Q: Are there any cathode current differences I should consider? A: The original TL431BCDR2 specifies 1 mA cathode current. TL431BCDR specifies 600 µA, representing a 40% reduction. This difference may affect circuit biasing in applications with tight current budgets. Verify cathode current requirements in your specific application before substitution.

Q: What packaging options are available? A: Substitute parts are available in Bulk, Tape & Reel (TR), Cut Tape & Digi-Reel, and Tube formats. All maintain the 8-SOIC (0.154", 3.90mm Width) physical package. Select packaging based on production volume and handling requirements; electrical performance is identical across all packaging formats.

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